LTC3127EDD#TRPBF Linear Technology, LTC3127EDD#TRPBF Datasheet

IC DCDC CONV BUCK BOOST 10DFN

LTC3127EDD#TRPBF

Manufacturer Part Number
LTC3127EDD#TRPBF
Description
IC DCDC CONV BUCK BOOST 10DFN
Manufacturer
Linear Technology
Datasheet

Specifications of LTC3127EDD#TRPBF

Applications
Energy Harvesting
Current - Supply
400µA
Voltage - Supply
1.8 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
10-DFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC3127EDD#TRPBFLTC3127EDD
Manufacturer:
LT
Quantity:
10 000
Company:
Part Number:
LTC3127EDD#TRPBFLTC3127EDD
Manufacturer:
LINEAR
Quantity:
20 000
Company:
Part Number:
LTC3127EDD#TRPBFLTC3127EDD#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
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applicaTions
Typical applicaTion
FeaTures
n
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USB OR Li-Ion
2.9V to 5.5V
Programmable (0.2A to 1A) ±4% Accurate Average
Input Current Limit
Regulated Output with Input Voltages Above,
Below or Equal to the Output
1.8V to 5.5V (Input) and 1.8V to 5.25V (Output)
Voltage Range
0.6A Continuous Output Current: V
1A Continuous Output Current: V
Single Inductor
Synchronous Rectification: Up to 96% Efficiency
Burst Mode
Output Disconnect in Shutdown
<1μA Shutdown Current
Small, Thermally Enhanced 10-Lead (3mm × 3mm ×
0.75mm) DFN and 12-Lead MSOP Packages
USB Powered GSM Modems
Supercap Charger
Handheld Test Instruments
PC Card Modems
Wireless Terminals
OFF
ON
USB or Li-Ion (500mA Maximum Input Current) to 3.3V
L1: COILCRAFT XPL4020-472ML
®
10µF
Operation: I
32.4k
V
MODE
SHDN
PROG
SW1
IN
SGND PGND
Q
4.7µH
L1
= 35μA (Pin Selectable)
SW2
V
OUT
FB
V
C
IN
IN
> 3V
100pF
> 1.8V
499k
320k
182k
Converter with Programmable
3127 TA01
2.2mF
V
3.3V
OUT
DescripTion
The LTC
fixed frequency buck-boost DC/DC converter that operates
from input voltages above, below or equal to the output
voltage. The LTC3127 features programmable average
input current limit, making it ideal for power-limited input
sources. The input current limit is programmed with a
single resistor and is accurate from 0.2A to 1A of average
input current.
The topology incorporated provides a continuous
transfer function through all operating modes. Other
features include <1μA shutdown current, pin-selectable
Burst Mode operation and thermal overload protection.
The LTC3127 is housed in thermally enhanced 10-lead
(3mm × 3mm × 0.75mm) DFN packages and 12-lead
MSOP packages.
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
and PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
®
3127 is a wide V
1A Buck-Boost DC/DC
100
90
80
70
60
50
2.5
Input Current Limit
3
Efficiency vs V
1A LOAD
IN
3.5
300mA LOAD
range, highly efficient, 1.35MHz
V
IN
4
(V)
4.5
IN
V
L = 4.7µH
F = 1.35MHz
OUT
LTC3127
= 3.3V
5
3127 TA01a
5.5

3127f

Related parts for LTC3127EDD#TRPBF

LTC3127EDD#TRPBF Summary of contents

Page 1

... DFN packages and 12-lead MSOP packages. L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks and PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ...

Page 2

... EXPOSED PAD (PIN 11) IS PGND, MUST BE SOLDERED TO PCB orDer inForMaTion LEAD FREE FINISH TAPE AND REEL LTC3127EDD#PBF LTC3127EDD#TRPBF LTC3127EMSE#PBF LTC3127EMSE#TRPBF Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. ...

Page 3

T PARAMETER Input Operating Range Output Voltage Adjust Feedback Voltage Feedback Input Current Quiescent Current—Burst Mode Operation Quiescent Current—Shutdown Quiescent Current—Active Input Current Limit Peak Current Limit Reverse-Current Limit P-Channel MOSFET Leakage ...

Page 4

LTC3127 Typical perForMance characTerisTics Efficiency vs Load Current 100 PWM V = 1.8V OUT 90 80 BURST ...

Page 5

Typical perForMance characTerisTics Feedback Voltage vs Temperature (Normalized) 0. 4.7µ 3.3V OUT V = 3.6V IN 0.00 –0.20 –0.40 –0.60 –0.80 –50 –30 – TEMPERATURE (°C) 3127 G09 PMOS ...

Page 6

LTC3127 Typical perForMance characTerisTics Load Transient Response in Burst Mode Operation, No Load to 1A, Not in Input Current Limit I LOAD 1A/DIV I IN 1A/DIV V OUT 50mV/DIV MODE 5V/DIV 200µs/DIV OUT R = ...

Page 7

FuncTions (DD Package) SW1 (Pin 1): Switch Pin Where Internal Switches A and B Are Connected. Connect inductor from SW1 to SW2. Minimize trace length to reduce EMI. V (Pin 2): Input Supply Pin. Internal V IN 10μF or ...

Page 8

LTC3127 block DiagraM – PEAK AMP SHDN MODE SAMPLE/HOLD AND RESET PROG V CLAMP R PROG  L SW1 SW2 I ZERO AMP PWM COMPARATOR + AND LOGIC – V OUT ...

Page 9

The LTC3127 is an average input current controlled buck- boost DC/DC converter offered in both a thermally enhanced 3mm × 3mm DFN package and a thermally enhanced 12- lead MSOP package. The buck-boost converter utilizes a proprietary switching algorithm ...

Page 10

LTC3127 operaTion Integral compensation is required if an output capacitor less than 1000µF but greater than 44µF is used, otherwise using proportional compensation is recommended. When compensating the converter with integral compen- sation it is important to consider that the ...

Page 11

The input current limit is set by the R on the PROG pin to SGND. The resistor value can be calculated using the following formula 54.92 • I (A) + 4.94 (kΩ) PROG LIMIT Where I is ...

Page 12

LTC3127 applicaTions inForMaTion A typical LTC3127 application circuit is shown on the front page of this data sheet. The external component selection is determined by the desired output voltage, input current and ripple voltage requirements for each particular applica- tion. ...

Page 13

Output and Input Capacitor Selection When selecting output capacitors for large pulsed loads, the magnitude and duration of the pulse current, together with the droop voltage specification, determine the choice of the output capacitor. Both the ESR of ...

Page 14

LTC3127 applicaTions inForMaTion Capacitor Selection Example In this example, a pulsed load application requires that V droops less than 300mV. The application is a Li-Ion OUT battery input to a 3.6V output. The pulsed load is a no-load to a ...

Page 15

PCB Layout Considerations The LTC3127 switches large currents at high frequencies. Special care should be given to the PCB layout to ensure stable, noise-free operation. Figure 4 depicts the recom- mended PCB layout to be utilized for the ...

Page 16

LTC3127 Typical applicaTions V IN USB PWM BURST OFF ON C1, C2: VISHAY TANTAMOUNT TANTALUM, LOW ESR CAPACITORS L1: COILCRAFT XPL4020-472ML PCMCIA/Compact Flash (3.3V or 5V/500mA Max), 3.8V GPRS, Class 10 Pulsed Load PWM BURST ...

Page 17

Typical applicaTions Stacked Supercapacitor Charger (1000mA Max Input Current 1.8V to 5.5V PWM BURST OFF ON L1: COILCRAFT XPL4020-472ML General Purpose Forced Continuous Conduction Application with 500µs Start- 4.3V PWM BURST OFF ON 10µF ...

Page 18

LTC3127 package DescripTion 3.55 0.05 1.65 0.05 2.15 0.05 (2 SIDES) 0.25 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN 1 TOP MARK (SEE NOTE 6) 0.200 REF NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION ...

Page 19

... LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 20

... V : 2.4V to 5.25V 35µA, IN OUT Q : 1.8V to 5.5V 1.8V to 5.25V 40µA, IN OUT Q : 2.4V to 5.5V 1.8V to 5.25V 35µA, IN OUT Q : 2. 1. 25µA, IN OUT Q LT 0210 • PRINTED IN USA  LINEAR TECHNOLOGY CORPORATION 2010 < 1µA, SD < 1µA, SD < 1µA, SD 3127f ...

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